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Finding the Fourth Proportional to 211.65, 317.20 and 108.71

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Solution

The fourth proportional to 211.65, 317.20 and 108.71 is: 162.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.65 : 317.20 = 108.71 : x
  2. Step 2: Convert to fraction form
    211.65/317.20 = 108.71/x
  3. Step 3: Cross multiply
    211.65x = 317.20 × 108.71
  4. Step 4: Simplify right side
    211.65x = 34,482.81
  5. Step 5: Solve for x
    x = 34,482.81/211.65
  6. Step 6: Final answer
    x = 162.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.